Improvement in screw-propellers



F. H. B. BABBE. SCREW PROPELLE-R.

Patented Feb. 15, 1876.

v jwah Zar N PETERS- PRO To all whom it maycon cm Be it vknown that I, H BABBE,.ot' Antioch,"i nthercounty of Gontra; Costa and State 'ofjGalifornia, have "invented an Improved Pro )el-ler-W l1eel \for Shi ind 1 do declarethat t e; renewing is full,-

lear, and exact description of thcsaiuethat will enable those skilledflin the art or science to which it most struct and use-m; therinvention"or.ex

'lteferencemay ,4 had drawings. This inventionrela s struction of propel attaching the" same operated','ivl ere up of the Water ated' with in'uch l v N A entiouwitho'ut furperin entq i to the accompanying 1' isists, mainly, of a; dis J I l1alfjo't'f which being connected by a stout shortarnitoa hub or navev tothe hub' and each other, are such that the point otcach :bl-ide ison "the' 'center line,ror-

no fiat or i against which t progress 0' e, all othwhicliiwill in'iprovedpropeller ele ation ofthes. j a A representsthe ft'u which thesclew, lis jforcedgby hydraul cgpressure for other vi'ell- Conical V i Specification regsp "t fLetters Pa e No. 173,575,

Marchl, 187 5- The positions of the blades,.withreterence 7 "r as described and shown. g 2. The combination, with the shaft A'and I blades D, of the naveand the bosses) Q,

when the said nave and bosses are construct- 'edj so as to present'rounding surfaces from "endjto end, substantially as described and V PATEliTT OFFICE. I

are forced againstreach endof the have, so as to form tight, smooth joints, and present round {ing surfaces from end to end.

The blades D1), are connected to the nave i by short stout arms, which are also constructed so that no resistance islhada by a counter wavezor current striking a resisting surface,- but' .williniss around thethro'at of the arms harmless. The blades 1) D are so bent or inv clined-as toact 'on the central line or axis of I revolution of tlle'liub, and, consequently, the strain is transmitted to the :hub at a point best able to resisti. 6., its greatest diameter, while the diameter. of the two arms are equiv'-- alent to threeof the longest diameters of the nun.

. ItTWill be seen that by this construction of screw-propellers no sharp angles orabutments appear against which the wave may strike or friction be had in its progress through the \vate'r,and that instead of angles, as in the ordinaryconstruction, nothing but curves are presented forthe water to act upon.

Having thus described my invention, what 4 I claim as new, and desire to secure by'Letters;Patent',is-- I ,s r i 1. The blades of a screw propeller, coni a structed-of half-disks, connected to the nave .byshort, stout arms, and bent substantially shown. i

In witness \vhercot'I, have hereunto set my [hand and'seal. v

i FRIEDRIGH H. B; BABBE. [L'. s.] Q Witnesses I 1 O. W.'M. SMITH,

PHILIP MAHLER;

dated February 15 1876; application filed 

